JP4012435B2 - Building damper - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a damper that suppresses shaking of a building when an earthquake occurs.
[0002]
[Prior art]
Conventionally, as a damper of a building , for example, there is one shown in FIG. The hydraulic damper 1 is arranged such that its piston rod 2, damper cylinder 4, outer tube 3 and the like extend substantially horizontally, and the tip end of the piston rod 2 is connected to the base side, and the base end of the outer tube 3 The department is connected to the building. As a result, the damper 1 expands and contracts to generate a damping force as the foundation side shakes in the horizontal direction when an earthquake occurs.
[0003]
A piston 5 is connected to the base end of the piston rod 2, and the piston 5 is slidably accommodated inside the damper cylinder 4. The interior of the damper cylinder 4 is partitioned by a piston 5 into a rod side cylinder chamber 7 and an end side cylinder chamber 8.
[0004]
A reservoir chamber 9 having a gas chamber in part is defined between the damper cylinder 4 and the outer tube 3. Inside the reservoir chamber 9, the gas and the hydraulic oil are divided into upper and lower parts, and an oil reservoir area 9 </ b> B where the hydraulic oil is accumulated and a gas reservoir area 9 </ b> A where the gas is accumulated are formed.
[0005]
In the pressure side stroke of the damper 1, hydraulic oil flows from the end side cylinder chamber 8 through the pressure side damping valve 11 into the rod side cylinder chamber 7, and hydraulic oil corresponding to the intrusion volume of the piston rod 2 enters the hydraulic side damping valve 12. Then, it flows into the reservoir chamber 9 and a predetermined damping force is generated.
[0006]
In the extension side stroke of the damper 1, the check valve 14 is opened, and hydraulic oil flows from the reservoir chamber 9 through the check valve 14 into the end side cylinder chamber 8, and from the rod side cylinder chamber 7 to the extension side damping valve 13. And flows into the end-side cylinder chamber 8 to generate a predetermined damping force.
[0007]
[Problems to be solved by the invention]
However, such a conventional damper 1 has the following problems.
[0008]
When the gas in the reservoir chamber 9 enters the rod side cylinder chamber 7 or the end side cylinder chamber 8, a predetermined damping force cannot be obtained. For this reason, care must be taken to keep the damper 1 substantially horizontal during construction.
[0009]
Since the reservoir chamber 9 is at substantially atmospheric pressure, the hydraulic oil cannot smoothly flow from the reservoir chamber 9 to the end-side cylinder chamber 8 during the extension stroke, resulting in insufficient suction and a predetermined damping force cannot be obtained. There was a possibility.
[0010]
-Since the reservoir chamber 9 is provided outside the damper cylinder 4, the outer diameter of the damper 1 becomes large, and it may be difficult to install the damper chamber 9 in a limited space of the building.
[0011]
This invention is made | formed in view of said problem, and it aims at providing the damper structure suitable for the damper of a building .
[0012]
[Means for Solving the Problems]
A first invention includes a piston connected to a piston rod, a damper cylinder for slidably mounting the piston, a rod side cylinder chamber and an end side cylinder chamber partitioned by the piston, and an end side cylinder chamber. The present invention is applied to a damper of a building including a reservoir chamber for storing hydraulic fluid corresponding to an intruding volume of a communicating piston rod.
[0013]
A tank cylinder that slidably houses a free piston to define the reservoir chamber, an urging means that urges the free piston in a direction to compress the reservoir chamber, and a tank cylinder and a damper cylinder are connected to each other. And a valve-side damping valve that opens the valve body when the pressure-side operation is performed and guides the hydraulic fluid from the end-side cylinder chamber to the reservoir chamber, and a valve-side hydraulic fluid that opens from the reservoir chamber when the expansion-side operation is performed. A check valve that leads the cylinder to the end side cylinder chamber is installed , an injection valve that injects hydraulic fluid into the reservoir chamber into the valve body, and an exhaust valve that discharges air from the end side cylinder chamber. A pressure-side damping valve that provides resistance to hydraulic fluid from the cylinder chamber toward the rod-side cylinder chamber, and resistance to hydraulic fluid that is directed from the rod-side cylinder chamber to the end-side cylinder chamber That is interposed between RuShingawa damping valve was assumed characterized.
[0014]
The second invention is characterized in that, in the first invention, a connecting portion connected to the support member is formed on the valve body.
[0016]
The third invention is characterized in that, in the first or second invention, a shut-off valve capable of shutting off a flow of hydraulic oil is interposed in the valve body.
[0017]
Operation and effect of the invention
According to the first invention, when the earthquake occurs, the damper causes the piston rod to extend and contract with respect to the damper cylinder, and a predetermined damping force is generated by the resistance applied by the damping valve.
[0018]
Since the hydraulic fluid stored in the reservoir chamber is pressurized by the biasing means of the free piston, the hydraulic fluid flows smoothly from the reservoir chamber to the end cylinder chamber when switching from the compression stroke to the expansion stroke. In addition, the occurrence of insufficient suction is prevented, and a predetermined damping force is obtained.
[0019]
Since the tank cylinder that defines the reservoir chamber is provided coaxially with the damper cylinder, the outer diameter of the damper is not increased by the tank cylinder, and restrictions on the space for the damper are reduced.
The valve body is arranged between the reservoir chamber and the end cylinder chamber, and the valve body is provided with an injection valve and an exhaust valve, so that the air in the damper can be reliably discharged when the hydraulic fluid is injected, A damping force is obtained.
[0020]
According to the second invention, since the valve body is connected to the foundation or the building, for example, the distance between the fulcrum on which the load provided on each of the piston rod and the valve body acts can be shortened, and the bending strength of the damper can be increased. . Further, since no load is applied to the tank cylinder, the strength required for the tank cylinder is reduced, and the weight can be reduced.
[0022]
According to the fourth invention, by closing the shut-off valve in a strong wind or the like, the damper function is locked and the shaking of the building can be suppressed.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0024]
FIG. 1 shows a seismic isolation damper 1 provided in a building that is seismically isolated. The damper 1 is connected between the foundation (ground) side and the building, and when the earthquake occurs, the damper 1 expands and contracts to generate a damping force.
[0025]
The hydraulic damper 1 includes a piston 5 connected to a piston rod 2, a damper cylinder 4 that slidably houses the piston 5, a rod side cylinder chamber 7 and an end side cylinder chamber 8 that are partitioned by the piston 5. And a reservoir chamber 9 that communicates with the end-side cylinder chamber 8 and stores hydraulic oil corresponding to the intrusion volume of the piston rod 2.
[0026]
As shown in FIG. 2, a compression side damping valve 11 and an extension side damping valve 13 are interposed in the piston 5. The piston 5 is formed with a through hole 41 that is opened and closed by the compression side damping valve 11 and a through hole 42 that is opened and closed by the extension side damping valve 13. The pressure-side damping valve 11 is opened in the pressure-side stroke in which the damper 1 is contracted and applies resistance to the hydraulic oil from the end-side cylinder chamber 8 toward the rod-side cylinder chamber 7. The expansion side damping valve 13 is opened in the expansion side stroke in which the damper 1 is extended and applies resistance to the hydraulic oil from the rod side cylinder chamber 7 toward the end side cylinder chamber 8.
[0027]
The damper 1 includes a tank cylinder 6 that defines a reservoir chamber 9, and a valve body 20 that coaxially connects the tank cylinder 6 and the damper cylinder 4. In the present embodiment, the tank cylinder 6 and the damper cylinder 4 are arranged coaxially with their respective central axes. However, the tank cylinder 6 and the damper cylinder 4 are offset from each other through the valve body 20, It is also possible to arrange them substantially in parallel.
[0028]
The cylindrical damper cylinder 4 has a cylinder head 17 coupled to one end thereof and a valve body 20 coupled to the other end thereof.
[0029]
The cylindrical tank cylinder 6 has a valve body 20 coupled to one end thereof and a bottom 18 coupled to the other end thereof.
[0030]
The valve body 20 is sandwiched between the cylindrical damper cylinder 4 and the tank cylinder 6 and is disposed coaxially with the damper cylinder 4 and the tank cylinder 6.
[0031]
The valve body 20 is provided with a compression side damping valve 12 and a check valve 14. The valve body 20 is formed with a through hole 43 that is opened and closed by the pressure-side damping valve 12 and a through hole 44 that is opened and closed by the check valve 14. The pressure-side damping valve 12 opens in the pressure-side stroke, and provides resistance to the hydraulic oil that travels from the end-side cylinder chamber 8 toward the reservoir chamber 9. The check valve 14 opens in the extension side stroke and guides the hydraulic oil from the reservoir chamber 9 toward the end side cylinder chamber 8 with almost no resistance.
[0032]
Further, an injection valve 21 for injecting hydraulic oil into the reservoir chamber 9 and an exhaust valve 22 for discharging air from the end side cylinder chamber 8 are interposed in the valve body 20. The valve body 20 is formed with a through hole 45 opened and closed by the injection valve 21 and a through hole 46 opened and closed by the exhaust valve 22. The injection valve 21 and the exhaust valve 22 include a plug 23 screwed into the valve body 20 and a check valve 24 interposed in the plug 23.
[0033]
A free piston 19 is slidably accommodated in the tank cylinder 6, and is divided into a reservoir chamber 9 and an atmospheric pressure chamber 16 by the free piston 19.
[0034]
As an urging means for compressing the reservoir chamber 9, a coiled spring 15 is compressed and interposed between the free piston 19 and the bottom 18.
[0035]
In the damper 1, one of the tip of the piston rod 2 and the valve body 20 is connected to the foundation side, and the other is connected to the building side.
[0036]
A mounting bracket (connecting portion) 29 is formed at the tip of the piston rod 2. The mounting bracket 29 is connected to the foundation side or the building side.
[0037]
A pair of boss portions (connecting portions) 25 are formed so as to protrude in the radial direction of the cylindrical valve body 20. Each cylindrical boss portion 25 is coaxially arranged, and an attachment bracket 30 is rotatably coupled to an outer peripheral surface thereof, and the attachment bracket 30 is connected to the foundation side or the building side.
[0038]
The injection valve 21 and the exhaust valve 22 are screwed and coupled to the inside of each boss portion 25.
[0039]
When hydraulic oil is injected into the damper 1, it is performed according to the following procedure.
(1) The piston rod 2 is contracted to the maximum and brought into contact with the valve body 20. The free piston 40 is in contact with the valve body 20 by the biasing force of the spring 15. (2) The damper 1 is arranged so as to extend substantially horizontally as shown, the injection valve 21 facing downward and the exhaust valve 22 facing upward.
(3) Open the exhaust valve 22 and inject pressurized hydraulic oil through the injection valve 21.
(4) Thus, the hydraulic oil fills the reservoir chamber 9, the end side cylinder chamber 8 and the rod side cylinder chamber 7 with the hydraulic oil, and the piston rod 2 is fully extended, and then the free piston 19 is stroked to place the spring 15. Shrink a fixed amount.
(5) The injection valve 21 and the exhaust valve 22 are closed.
[0040]
The damper 1 has a structure in which the valve body 20 is disposed between the reservoir chamber 9 and the end side cylinder chamber 8 and the valve body 20 is provided with an injection valve 21 and an exhaust valve 22. The air inside can be discharged reliably. As a result, the predetermined damping force can be obtained by avoiding that air is mixed into the hydraulic oil.
[0041]
At the time of construction, since the air in the damper 1 is removed, it is not necessary to keep the damper 1 substantially horizontal as in the conventional device, and the construction work can be performed easily.
[0042]
The piston rod 2 expands and contracts with respect to the damper cylinder 4 as the foundation side shakes with respect to the building when an earthquake occurs.
[0043]
In the pressure side stroke of the damper 1, hydraulic oil flows from the end side cylinder chamber 8 through the pressure side damping valve 11 into the rod side cylinder chamber 7, and hydraulic oil corresponding to the intrusion volume of the piston rod 2 enters the hydraulic side damping valve 12. A predetermined damping force is generated by the resistance applied by the compression side damping valves 11 and 12 through the reservoir chamber 9.
[0044]
In the extension side stroke of the damper 1, the check valve 14 is opened, and hydraulic oil flows from the reservoir chamber 9 through the check valve 14 into the end side cylinder chamber 8, and from the rod side cylinder chamber 7 to the extension side damping valve 13. A predetermined damping force is generated by the resistance applied by the expansion side damping valve 13 through the end side cylinder chamber 8 and the expansion side damping valve 13.
[0045]
Since the reservoir chamber 9 is pressurized by the urging force of the spring 15, the hydraulic oil smoothly flows from the reservoir chamber 9 to the end side cylinder chamber 8 when switching from the compression side stroke to the extension side stroke, and the suction is insufficient. Is prevented, and a predetermined damping force is obtained.
[0046]
Since the tank cylinder 6 that defines the reservoir chamber 9 is provided coaxially with the damper cylinder 4, the outer diameter of the damper 1 does not have to be increased by the tank cylinder 6, and there are few restrictions on the interposing space of the damper 1. To do.
[0047]
The damper 1 has a structure in which the tip of the piston rod 2 and the valve body 20 are supported on the foundation side and the building side via the mounting brackets 29 and 30, respectively. Can be enhanced. Further, since no load is applied to the tank cylinder 6, the strength required for the tank cylinder 6 is reduced, and the weight can be reduced.
[0048]
As another embodiment, the damper 1 shown in FIG. 3 has one end connected to the foundation side and the other end connected to the building side of the tip end of the piston rod 2 and the tip end of the tank cylinder 6. A mounting bracket 31 is formed at the tip of the tank cylinder 6. The mounting bracket 29 is connected to the foundation side or the building side. In this case, the distance between the fulcrum with respect to a building and the foundation side can be extended.
[0049]
Next, another embodiment shown in FIG. 4 will be described. In addition, the same code | symbol is attached | subjected to the same component as the said embodiment.
[0050]
In the damper 1, the valve body 20 is provided with a shutoff valve 50 that can shut off the flow of hydraulic oil. By closing the shut-off valve 50 in a strong wind or the like, the damper 1 is locked in its damper function and suppresses the shaking of the building.
[0051]
The shut-off valve 50 includes a plug 51 interposed in the valve body 20, a port 52 formed in the plug 51, a valve body 53 that opens and closes the port 52, and biases the valve body 53 in the valve opening direction. A spring 54 and a solenoid 55 that urges the valve body 53 in the valve closing direction against the spring 54 are provided. The port 52 is interposed in the middle of the through hole 43 through which the hydraulic oil flows via the compression side damping valve 12.
[0052]
A safety valve 57 is interposed in the valve body 20, and the safety valve 57 opens as the pressure in the end side cylinder chamber 8 rises above a predetermined value.
[0053]
Normally, the solenoid 55 is not energized via a controller (not shown), and the shutoff valve 50 is open. Thereby, the piston rod 2 expands and contracts with respect to the damper cylinder 4 as the foundation side shakes with respect to the building at the time of the earthquake occurrence, and exhibits a damper function.
[0054]
For example, during a strong wind such as a typhoon, the solenoid 55 is energized through the controller to close the shut-off valve 50. Thereby, in the pressure side stroke of the damper 1, hydraulic oil corresponding to the intruding volume of the piston rod 2 tends to flow from the end side cylinder chamber 8 to the reservoir chamber 9 through the hydraulic side damping valve 12 as indicated by an arrow in the figure. However, the shut-off valve 50 shuts off this flow, the damper function is locked, and the shaking of the building is suppressed.
[0055]
The damper of the present invention is not limited to a seismic isolation damper for a building, but can also be used as a seismic isolation damper for a display stand or a vibration damping damper for a building.
[0056]
The present invention is not limited to the above-described embodiment, and it is obvious that various modifications can be made within the scope of the technical idea.
[Brief description of the drawings]
FIG. 1 is a sectional view of a damper showing an embodiment of the present invention.
2 is an enlarged cross-sectional view of a part of FIG.
FIG. 3 is a cross-sectional view of a damper showing another embodiment.
FIG. 4 is a partial cross-sectional view of a damper showing another embodiment.
FIG. 5 is a cross-sectional view of a damper showing a conventional example.
[Explanation of symbols]
1 damper 2 piston rod 4 damper cylinder 5 piston 6 tank cylinder 7 rod side cylinder chamber 8 end side cylinder chamber 9 reservoir chamber 12 pressure side damping valve 14 check valve 15 spring (biasing means)
20 Valve body 21 Injection valve 22 Exhaust valve 25 Boss part (connection part)
29 Mounting bracket (connection part)
30 Mounting bracket 50 Shut-off valve

Claims (3)

A piston connected to the piston rod, a damper cylinder for slidably mounting the piston, a rod side cylinder chamber and an end side cylinder chamber partitioned by the piston, and an end of the piston rod communicating with the end side cylinder chamber In a building damper comprising a reservoir chamber for storing a volume of hydraulic fluid, a tank cylinder that slidably houses a free piston to define the reservoir chamber, and compresses the reservoir chamber with the free piston Urging means for urging in the direction, and a valve body connecting the tank cylinder and the damper cylinder. The valve body is opened when the pressure side is operated, and the hydraulic fluid from the end side cylinder chamber is supplied to the reservoir chamber. A pressure-side damping valve that leads to the pressure chamber, and opens during the extension-side operation to supply the hydraulic fluid from the reservoir chamber. A check valve that leads to a cylinder chamber on the cylinder side, an injection valve that injects hydraulic fluid into the reservoir chamber into the valve body, and an exhaust valve that discharges air from the cylinder chamber on the end side, and the piston A pressure-side damping valve for imparting resistance to the hydraulic fluid from the end-side cylinder chamber toward the rod-side cylinder chamber, and an expansion-side damping valve for imparting resistance to the hydraulic fluid from the rod-side cylinder chamber toward the end-side cylinder chamber; A damper of a building characterized by interposing. The building damper according to claim 1, wherein a connecting portion connected to a support member is formed on the valve body. The building damper according to claim 1 or 2, wherein a shut-off valve capable of shutting off a flow of hydraulic fluid is interposed in the valve body.

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